Namibia: Namib Sand Sea&quot;Namib Sand Sea is the only coastal desert in the world that includes 
extensive dune fields influenced by fog. Covering an area of over three 
million hectares and a buffer zone of 899,500 hectares, the site is 
composed of two dune systems, an ancient semi-consolidated one overlain 
by a younger active one. The desert dunes are formed by the 
transportation of materials thousands of kilometres from the hinterland,
 that are carried by river, ocean current and wind. It features gravel 
plains, coastal flats, rocky hills, inselbergs within the sand sea, a 
coastal lagoon and ephemeral rivers, resulting in a landscape of 
exceptional beauty. Fog is the primary source of water in the site, 
accounting for a unique environment in which  endemic invertebrates, 
reptiles and mammals adapt to an ever-changing variety of microhabitats 
and ecological niches.&quot; — UNESCO